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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated income before provision for income taxes [Abstract]      
U.S. $ 184,476,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 307,994,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 259,309,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign 114,031,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 248,946,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 85,933,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Consolidated income before provision for income taxes 298,507,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 556,940,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 345,242,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current [Abstract]      
Federal 37,402,000us-gaap_CurrentFederalTaxExpenseBenefit 81,871,000us-gaap_CurrentFederalTaxExpenseBenefit 70,727,000us-gaap_CurrentFederalTaxExpenseBenefit
State 2,095,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 361,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,425,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 48,904,000us-gaap_CurrentForeignTaxExpenseBenefit 148,310,000us-gaap_CurrentForeignTaxExpenseBenefit 45,851,000us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense (benefit) 88,401,000us-gaap_CurrentIncomeTaxExpenseBenefit 230,542,000us-gaap_CurrentIncomeTaxExpenseBenefit 119,003,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred [Abstract]      
Federal (380,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (2,831,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 12,918,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 444,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 551,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 656,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign 20,866,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (36,210,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (8,980,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) 20,930,000us-gaap_DeferredIncomeTaxExpenseBenefit (38,490,000)us-gaap_DeferredIncomeTaxExpenseBenefit 4,594,000us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes 109,331,000us-gaap_IncomeTaxExpenseBenefit 192,052,000us-gaap_IncomeTaxExpenseBenefit 123,597,000us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets [Abstract]      
Inventory differences 12,362,000us-gaap_DeferredTaxAssetsInventory 2,927,000us-gaap_DeferredTaxAssetsInventory  
Foreign tax credit and other foreign benefits 116,603,000nus_DeferredTaxAssetsForeignTaxCreditAndOtherForeignBenefits 120,534,000nus_DeferredTaxAssetsForeignTaxCreditAndOtherForeignBenefits  
Stock-based compensation 17,211,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 18,132,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Accrued expenses not deductible until paid 48,189,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 88,465,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Foreign currency exchange 10,774,000nus_DeferredTaxAssetsForeignCurrencyExchange 13,734,000nus_DeferredTaxAssetsForeignCurrencyExchange  
Net operating losses 17,530,000nus_DeferredTaxAssetsNetOperatingLosses 10,808,000nus_DeferredTaxAssetsNetOperatingLosses  
Capitalized research and development 3,362,000nus_DeferredTaxAssetsCapitalizedResearchAndDevelopment 6,202,000nus_DeferredTaxAssetsCapitalizedResearchAndDevelopment  
Exchange gains and losses 41,542,000nus_DeferredTaxAssetsExchangeGainsAndLosses 0nus_DeferredTaxAssetsExchangeGainsAndLosses  
Other 841,000us-gaap_DeferredTaxAssetsOther 739,000us-gaap_DeferredTaxAssetsOther  
Gross deferred tax assets 268,414,000us-gaap_DeferredTaxAssetsGross 261,541,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities [Abstract]      
Exchange gains and losses 0nus_DeferredTaxLiabilitiesExchangeGainsAndLosses 9,924,000nus_DeferredTaxLiabilitiesExchangeGainsAndLosses  
Intangibles step-up 15,106,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 16,375,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Overhead allocation to inventory 10,781,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts 2,523,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts  
Amortization of intangibles 18,374,000nus_DeferredTaxLiabilitiesAmortizationOfIntangibles 17,360,000nus_DeferredTaxLiabilitiesAmortizationOfIntangibles  
Foreign outside basis in controlled foreign corporation 100,016,000nus_DeferredTaxLiabilitiesForeignOutsideBasisInControlledForeignCorporation 76,470,000nus_DeferredTaxLiabilitiesForeignOutsideBasisInControlledForeignCorporation  
Other 48,187,000us-gaap_DeferredTaxLiabilitiesOther 63,409,000us-gaap_DeferredTaxLiabilitiesOther  
Gross deferred tax liabilities 192,464,000us-gaap_DeferredTaxLiabilities 186,061,000us-gaap_DeferredTaxLiabilities  
Valuation allowance (35,999,000)us-gaap_DeferredTaxAssetsValuationAllowance (10,803,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred taxes, net 39,951,000us-gaap_DeferredTaxAssetsLiabilitiesNet 64,677,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Deferred tax assets, net, classification [Abstract]      
Net current deferred tax assets 40,840,000us-gaap_DeferredTaxAssetsNetCurrent 73,456,000us-gaap_DeferredTaxAssetsNetCurrent  
Net noncurrent deferred tax assets 15,128,000us-gaap_DeferredTaxAssetsNetNoncurrent 5,174,000us-gaap_DeferredTaxAssetsNetNoncurrent  
Total net deferred tax assets 55,968,000us-gaap_DeferredTaxAssetsNet 78,630,000us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities, classification [Abstract]      
Net current deferred tax liabilities 0us-gaap_DeferredTaxLiabilitiesCurrent 1,000us-gaap_DeferredTaxLiabilitiesCurrent  
Net noncurrent deferred tax liabilities 16,017,000us-gaap_DeferredTaxLiabilitiesNoncurrent 13,952,000us-gaap_DeferredTaxLiabilitiesNoncurrent  
Total net deferred tax liabilities 16,017,000nus_TotalNetDeferredTaxLiabilities 13,953,000nus_TotalNetDeferredTaxLiabilities  
Effective income tax rate, continuing operations, tax rate reconciliation [Abstract]      
Income taxes at statutory rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Indefinitely invested earnings of non-U.S. subsidiaries (in hundredths) 0.00%nus_EffectiveIncomeTaxRateReconciliationIndefinitelyInvestedEarningsOfNonUSSubsidiariesPercent (0.76%)nus_EffectiveIncomeTaxRateReconciliationIndefinitelyInvestedEarningsOfNonUSSubsidiariesPercent 0.00%nus_EffectiveIncomeTaxRateReconciliationIndefinitelyInvestedEarningsOfNonUSSubsidiariesPercent
Non-deductible expenses (in hundredths) 0.12%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.12%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.12%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Extraterritorial income tax credit (in hundredths) 1.48%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Other (in hundredths) 0.03%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.12%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.68%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate, continuing operations (in hundredths) 36.63%us-gaap_EffectiveIncomeTaxRateContinuingOperations 34.48%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Undistributed earnings of foreign subsidiaries 50,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Deferred tax liabilities undistributed foreign earnings 5,300,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings    
Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Years in which foreign operating loss carryforwards will expire Dec. 31, 2014    
Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Years in which foreign operating loss carryforwards will expire Dec. 31, 2023    
Foreign Country [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 74,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Operating loss carryforwards scheduled to expire 49,600,000nus_OperatingLossCarryforwardsScheduledToExpire
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Operating loss carrying that will not expire 24,600,000nus_OperatingLossCarryingThatWillNotExpire
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Operating loss carryforwards, valuation allowance $ 31,000,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember